Description

MACO power supplies are robust, highly reliable, transformer sources of power for lifting magnets. They are available in a wide range of power outputs with many functions, either as a source of electrical power without a backup supply, or with a battery backup supply to ensure an uninterrupted source of electrical power.

MACOdrive power supplies are fully controllable power supplies for crane electromagnets with an operational four-quadrant converter and dynamic demagnetization using regenerative power to net. This enables the convenient operation of electromagnets with continuous operational control and extremely fast demagnetization.

They are available in a wide range of outputs without backup supply or, for increased safety, with a battery backup that provides continuous power. MACOdrive power supplies are suitable for magnet systems with higher power outputs from 5kW to 50kW.

The advantage of MACOdrive power supplies are their compact features – just a single box can accommodate up to 10kW of power, including the battery backup

MACOperm power supplies are designed for power supply technology and operating of electro permanent magnets. A DC converter is used to power the magnet. Electro permanent magnets retain their magnetization even in the event of power failure or cable damage, so they do not need a backup battery supply.

MACOperm power supplies enable the convenient operation of electro permanent magnets, including adjusting the retaining power and fast demagnetization. It takes a few seconds for magnetization to occur by a pulse of voltage from the converter. The second pulse with reverse polarity causes demagnetization.

Safety

For MACO power supplies, the battery backup is connected online throughout the transfer of the load. If a power failure occurs in the network during the course of magnetization, the battery takes over powering the magnet without any interruption. Any variation from the nominal voltage in the event of a loss of one phase or drop in system voltage is closely monitored. These statuses are immediately signaled both visually and acoustically. Circuits and backup functions are always tested when magnetization is switched on and in the event of a failure, the magnetization process is terminated. The ground connection for the magnet is continuously monitored as well, it is indicated if it occurs and further magnetization is prevented.To prevent the magnet from overheating, the electrical current and duration of magnetization are measured and monitored at the same time.If the customer desires, a MACO power supplies can be delivered in the 3rd or 4th safety category ( EN ISO 13849-1). We also deliver redundant power supplies for use in ports or other highly exposed areas.

MACOdrive power supplies include an off-line backup battery. If a power failure occurs in the network during the course of magnetization, the battery takes over powering the magnet without any interruption.

Any variation from the nominal voltage in the event of a loss of one phase or drop in system voltage is closely monitored. These statuses are immediately signaled both visually and acoustically.

Circuits and backup functions are tested periodically when magnetization is switched on and in the event of a failure, the magnetization process is terminated.

To prevent the magnet from overheating, the electrical current and duration of magnetization are measured and monitored at the same time.

If the customer desires, a MACOdrive power supplies can be delivered in the 3rd or 4th safety category (EN ISO 13849-1). We also deliver redundant power supplies for use in ports or other highly exposed areas.

For cranes that use the MACOperm power supplies for electro permanent magnets, safety is ensured primarily by the physical principle of these magnets, which retain their magnetization after being magnetized until they are demagnetized.

A load test is used to ensure there is sufficient retaining force for the transfer of material and involves using a decreased electromagnetic force to grab the material for transfer, followed by increasing the attraction force to maximum before the crane gets underway.

In accordance with customer requirements, the power supply can be delivered Ex “p” according to EN/IEC 60079-0, 60079-2.

Backup

The backup power source consists of gelled batteries with a lifetime of 10 years. These batteries are charged and maintained at full capacity using a high-frequency charger with a precise charging performance. This ensures the maximum lifetime of the batteries. The battery’s condition is detected using a load test. The backup circuits include protection against deep discharging the batteries.

The backup power source consists of gelled batteries with a lifetime of 10 years. These batteries are charged and maintained at full capacity using a high-frequency charger with a precise charging performance. This ensures the maximum lifetime of the batteries. The battery’s condition is detected using a load test. The backup circuits include protection against deep discharging the batteries.

Due to the propertiesanddesignof this type ofelectromagnetthere is no battery backup required.

Control

After switching magnetization on, the power circuits are connected to the power supply circuits and the electromagnet attracts the load. In order to enable the operator to control the quantity of the material for transfer, a tipping function can be added to the controls. Depending on the length of the signal, undesirable material is detached from the magnet. After demagnetization is activated, the system is disconnected from the power network and the magnet is quickly discharged with discharge resistance. A switch in the polarity of the DC output then occurs, followed by the short demagnetization of the magnet by reverse polarity voltage and reduced intensity. This results in a clean sweep of the activated surface of the magnet. The magnet is automatically prepared for operation. If the device is equipped with the load test feature, the magnetization is reduced upon activation to 70% of the retaining power for each load, then increased to full power, whereupon the crane is unblocked and can move. This way the operator is certain of the safe conditions for transporting the material.Prior to magnetization, the power output can be switched to up to ten degrees of magnetization.Working with groups ofmagnets ispossible infullrange of standardandoptional functionsfor each groupseparately.

When the command magnet on is activated, the DC converter which is standby until this time, supplying DC voltage to the magnet. DC converter supplies magnet short time by increased voltage (boost) in order to achieve the fastest maximum level of magnetization due to induction of the magnet.

In case the load test is required, the magnet is powered by low voltage (fixed set or continuously adjustable), and after receiving a signal of the crane lift or after a set time, DC converter supply voltage to magnet at the maximum. Load test and power of the converter is continuously adjustable by potentiometer.

The tipping function for release of undesirable material is provided by reduced voltage of DC converter. As longas thetipping signalis made, voltage is continuously decreasingto0VDC. Speed of voltage reduction can be set by SW in PLC. Depending on the factory application in this way can be release each individual lifted sheet plates, in case scrap weighed to the containers in foundries, in this way can be supplied different kind of scraps as well.

Demagnetization is provides also by DC converter circuits, therefore it is faster than during switching circuits demagnetization and depolarization by contactors.

Working with groupsof magnetsis possiblein thepreferences only.

When the command magnet on activated, the magnet is powered short term by voltage from the DC converter for achieve full performance of the magnet. Then DC converter is put into standby mode.

The tipping function for release of undesirable material is provided by DC converter circuit so that the magnet is powered reversed polarity reduced voltage than the magnetization.Setting thelevelofDCvoltageispartof theprograminthePLCandtheparameterizationof thedriveDCconverter.

Demagnetization is provided by DC voltage circuits from converter with reverse polarity to clean the full active area of ​​the magnet. The magnet is automatically ready for operation.

Working with groupsof magnetsis possiblein thepreferences only.

Signalling

The status of the equipment is indicated by visual beacons or signaling components in the crane cabin in combination with acoustic signals. The indicators can be checked by pressing a button.

The status of the equipment is indicated by visual beacons or signaling components in the crane cabin in combination with acoustic signals. The indicators can be checked by pressing a button.

The status of the equipment is indicated by visual beacons or signaling components in the crane cabin in combination with acoustic signals. The indicators can be checked by pressing a button.